Castillo de San Marcos National Monument
Closure Information See 2 current alerts
Current alerts (2)
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Closure
Construction for Seawall Project
Starting July 27, 2026, Castillo de San Marcos National Monument will begin construction to replace, raise and rehabilitate the park’s failing seawalls. The historic fort will remain accessible throughout the project. Some areas outside of the fort will be closed for safety.
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Information
Fee Stations Credit Card Only
Fee Stations are only accepting credit cards for the purchase of entry tickets and passes.
Hours
Castillo de San Marcos National Monument
| Every day | 9:00AM - 5:00PM |
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The Castillo de San Marcos is open to the public 7 days per week, except Thanksgiving Day (fourth Thursday in November) and Christmas Day (December 25). A maximum capacity of 100 visitors in the historic fort at any time will be in effect. First admission is at 9:00 a.m. and last admission is at 5:00 p.m. The Castillo closes and visitors must exit at 5:15 p.m. The park grounds are closed from midnight until 5:30 a.m.
About this park
Built by the Spanish in St. Augustine to defend Florida and the Atlantic trade route, Castillo de San Marcos National Monument preserves the oldest masonry fortification in the continental United States and interprets more than 450 years of cultural intersections.